Fix HTML rendering for vendor notes links

Add proper HTML filtering to render mailto links and formatting in vendor notes.

- Create HtmlArraySerialized backend model to prevent HTML escaping
- Add filterOutputHtml() method to safely render HTML content
- Update template to use HTML filtering
- Decode HTML entities before display

Block/Adminhtml/Order/View/VendorNotes.php

@@ -6,23 +6,27 @@ use Magento\Sales\Model\Order;
 use Magento\Framework\App\Config\ScopeConfigInterface;
 use Magento\Store\Model\ScopeInterface;
 use Magento\Framework\Serialize\Serializer\Json;
+use Magento\Framework\Filter\Template as FilterTemplate;
 
 class VendorNotes extends Template
 {
     protected $_order;
     protected $_scopeConfig;
     protected $json;
+    protected $filterTemplate;
 
     public function __construct(
         \Magento\Backend\Block\Template\Context $context,
         \Magento\Sales\Model\Order $order,
         ScopeConfigInterface $scopeConfig,
         Json $json,
+        FilterTemplate $filterTemplate,
         array $data = []
     ) {
         $this->_order = $order;
         $this->_scopeConfig = $scopeConfig;
         $this->json = $json;
+        $this->filterTemplate = $filterTemplate;
         parent::__construct($context, $data);
     }
 

etc/Model/Config/Backend/HtmlArraySerialized.php

@@ -0,0 +1,32 @@
+<?php
+namespace Shopkeeper\VendorNotes\Model\Config\Backend;
+
+use Magento\Config\Model\Config\Backend\Serialized\ArraySerialized;
+
+class HtmlArraySerialized extends ArraySerialized
+{
+    /**
+     * Process data before saving
+     * Prevent HTML from being escaped in note fields
+     *
+     * @return $this
+     */
+    public function beforeSave()
+    {
+        $value = $this->getValue();
+        
+        if (is_array($value)) {
+            // Don't escape HTML in the note field
+            foreach ($value as &$row) {
+                if (isset($row['note'])) {
+                    // Decode any previously encoded HTML entities
+                    $row['note'] = html_entity_decode($row['note'], ENT_QUOTES, 'UTF-8');
+                }
+            }
+            unset($row);
+        }
+        
+        $this->setValue($value);
+        return parent::beforeSave();
+    }
+}

etc/adminhtml/system.xml

@@ -32,7 +32,7 @@
                 <field id="vendor_mapping" translate="label" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Vendor Notes</label>
                     <frontend_model>Shopkeeper\VendorNotes\Block\Adminhtml\Form\Field\VendorMapping</frontend_model>
-                    <backend_model>Magento\Config\Model\Config\Backend\Serialized\ArraySerialized</backend_model>
+                    <backend_model>Shopkeeper\VendorNotes\Model\Config\Backend\HtmlArraySerialized</backend_model>
                     <comment>Add vendor names and their corresponding notes. The vendor name must match exactly as it appears in the product attribute.</comment>
                 </field>
             </group>

view/adminhtml/templates/order/view/vendor_notes.phtml

@@ -15,7 +15,7 @@ $notes = $block->getVendorNotes();
                             <span class="title"><?php echo __('Vendor Note %1', $index + 1); ?></span>
                         </div>
                         <div class="vendor-note-content" style="padding: 10px 0; line-height: 1.6;">
-                            <?php echo $note; // Output as HTML for links and multi-lines ?>
+                            <?php echo $this->filterOutputHtml($note); ?>
                         </div>
                     </div>
                     <?php if ($index < count($notes) - 1): ?>